There are lots of online stores from fellow YTer's...that is always a good place to start....
Here is the dress we had made for LilyGrace
LilyGrace Dress http://www.lppboutique.com/
There are other great dress makers on here too...
Check out some of their links here
Sites
OR
FEATURED SELLERS
There are a lot of ladies on here who make WONDERFUL dresses!!!
chloebella
http://www.chloebella.com/ go.fetch
and more...........